JoaoJandre commented on PR #10632: URL: https://github.com/apache/cloudstack/pull/10632#issuecomment-2976349420
> @JoaoJandre, when testing some more advanced workflows of creation, reversion and deletion of disk-only VM snapshots, I created the following scenario: > > * Created snapshots `s1`, `s2` and `s3` > > * Reverted to snapshot `s2` and created snapshot `s4` > > > Then, I deleted snapshot `s2` and verified that it was marked as `Hidden` in the DB. Deleted snapshot `s1` and reverted to snapshot `s3`: > >  > >  > > When reverting to the `s3` snapshot, the operation failed: > >  > > The logs seem to indicate an error when creating the new delta for the volume: > > ```shell > 2025-06-15 15:29:11,565 DEBUG [resource.wrapper.LibvirtRevertDiskOnlyVMSnapshotCommandWrapper] (AgentRequest-Handler-1:[]) (logid:59368419) Creating new delta for volume [4b80abb2-562c-4325-b68f-3655e933daeb] as part of the disk-only VM snapshot revert process for VM [i-2-14-VM]. > 2025-06-15 15:29:11,565 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:59368419) Executing command [qemu-img create -f qcow2 -F qcow2 -b /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/d0dd008e-9458-4995-b9ca-e0f41bb73556 /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd ]. > 2025-06-15 15:29:11,584 WARN [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:59368419) Execution of process [8348] for command [qemu-img create -f qcow2 -F qcow2 -b /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/d0dd008e-9458-4995-b9ca-e0f41bb73556 /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd ] failed. > 2025-06-15 15:29:11,584 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:59368419) Exit value of process [8348] for command [qemu-img create -f qcow2 -F qcow2 -b /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/d0dd008e-9458-4995-b9ca-e0f41bb73556 /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd ] is [1]. > 2025-06-15 15:29:11,584 WARN [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:59368419) Process [8348] for command [qemu-img create -f qcow2 -F qcow2 -b /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/d0dd008e-9458-4995-b9ca-e0f41bb73556 /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd ] encountered the error: [qemu-img: /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd: Could not open backing file: Could not open backing file: Could not open '/mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/4b80abb2-562c-4325-b68f-3655e933daeb': No such file or directoryCould not open backing image.]. > 2025-06-15 15:29:11,584 ERROR [resource.wrapper.LibvirtRevertDiskOnlyVMSnapshotCommandWrapper] (AgentRequest-Handler-1:[]) (logid:59368419) Exception while reverting disk-only VM snapshot for VM [i-2-14-VM]. Deleting leftover deltas. org.apache.cloudstack.utils.qemu.QemuImgException: qemu-img: /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd: Could not open backing file: Could not open backing file: Could not open '/mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/4b80abb2-562c-4325-b68f-3655e933daeb': No such file or directoryCould not open backing image. > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:268) > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:200) > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:297) > at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRevertDiskOnlyVMSnapshotCommandWrapper.execute(LibvirtRevertDiskOnlyVMSnapshotCommandWrapper.java:71) > at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRevertDiskOnlyVMSnapshotCommandWrapper.execute(LibvirtRevertDiskOnlyVMSnapshotCommandWrapper.java:43) > -- > at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) > at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) > at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) > at java.base/java.lang.Thread.run(Thread.java:840) > > 2025-06-15 15:29:11,591 DEBUG [cloud.agent.Agent] (AgentRequest-Handler-1:[]) (logid:59368419) Seq 1-6557804007404863671: { Ans: , MgmtId: 169551026600426, via: 1, Ver: v1, Flags: 110, [{"com.cloud.agent.api.Answer":{"result":"false","details":"Exception: org.apache.cloudstack.utils.qemu.QemuImgException > Message: qemu-img: /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd: Could not open backing file: Could not open backing file: Could not open '/mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/4b80abb2-562c-4325-b68f-3655e933daeb': No such file or directoryCould not open backing image. > Stack: org.apache.cloudstack.utils.qemu.QemuImgException: qemu-img: /mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/f9fa34c3-993a-47d1-a7aa-6c08ec23f9dd: Could not open backing file: Could not open backing file: Could not open '/mnt/10d28cdf-71a7-33ad-802e-f4ec9042e4fd/4b80abb2-562c-4325-b68f-3655e933daeb': No such file or directoryCould not open backing image. > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:268) > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:200) > at org.apache.cloudstack.utils.qemu.QemuImg.create(QemuImg.java:297) > ``` > > Below are uploaded the full workflow execution logs: > > * [ms-logs.txt](https://github.com/user-attachments/files/20746296/ms-logs.txt) > > * [agent-logs.txt](https://github.com/user-attachments/files/20746297/agent-logs.txt) @bernardodemarco thank you for the tests, I'll check it out as soon as possible. -- This is an automated message from the Apache Git Service. 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